As may you have heard that Ringo, quite a popular voca-p, has deleted her Twitter, Piapro accounts and most of her creations on Niconico and Youtube, that why her songs and off vocals were lost. But thanks to her fans a big part of content was reuploaded. 
Despite it, some off vocals isn't availible. I decided to upload some instrumentals that I had found on my computer, Youtube and search for others. So, there is a compilation of it. List isn't full, I would be grateful if you could share missing off vocals. 
We dont know what happened with Ringo, but wouldn't it be nice to memorialize her by doing some covers? I think she deserves it.

Off vocal links:

tributes - http://www.mediafire.com/file/bp67i3jy4qlc31k/tributes.mp3/file
甘蕉 - http://www.mediafire.com/file/z6qk4j9kd2110x2/%E7%94%98%E8%95%89inst.wav/file
黙々 - http://www.mediafire.com/file/u3p3fud4tdtubuo/%E9%BB%99%E3%80%85inst.wav/file
決 - http://www.mediafire.com/file/01u0vc28r5d12n4/%E6%B1%BAinst_mogami_201812220207.mp3/file

Links of other users in description:
by ha na
https://www.youtube.com/watch?time_continue=1&v=OgZsCZUiejI
by enaclilac 
https://www.youtube.com/watch?v=JtZA1PJhxJA

Ringo's off vocal links, please read and repost, if it isn't difficult

mrackobes_2